1 / 20

Overview

Overview. Physics of Proton-rich Nuclei in the UK Mike Bentley (Univ. of York, UK). Outline: Recent Highlights: RISING physics at GSI Isospin studies at MSU Shapes and Symmetries (JYFL) Prospects: Short term developments Future facilities. Overview.

summer
Télécharger la présentation

Overview

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Overview Physics of Proton-rich Nuclei in the UK Mike Bentley (Univ. of York, UK) • Outline: • Recent Highlights: • RISING physics at GSI • Isospin studies at MSU • Shapes and Symmetries (JYFL) • Prospects: • Short term developments • Future facilities Cosenors - Bentley

  2. Overview • How well does Isospin symmetry hold as A or Tz is increased? • Limits of nuclear existence • rp-process near the drip line • Evolution of nuclear shapes • n-p pairing

  3. Overview Current facilities (not exhasutive) JYFL – Jurogam + RITU + GREAT (recoil decay tagging) ANL – Gammasphere + FMA (recoil tagging) GSI – RISING stopped beam campaign (decay spectroscopy) REX-ISOLDE – Miniball (Coulex of exotic beams) Cosenors - Bentley

  4. Example: RISING at GSI RISING Rare Isotopic Spectroscopic INvestigations @ GSI = 15 x Cluster germaniums for (the most) exotic gamma-ray spectroscopy

  5. Example: RISING at GSI Fragment Separator (FRS) Focal Pane ID Stopped RISING • Chemically independent production mechanism for secondary • radioactive beams. • Time of flight from production to stopper ~x00ns. • Some ions transmitted in metastable states.

  6. Example: RISING at GSI

  7. Example: RISING at GSI

  8. Example: RISING at GSI

  9. Example: RISING at GSI A.B. Garnsworthy et al., Phys. Lett. B660, 326 (2008)

  10. Example: Fragmentation at MSU 10pnA 58Ni 600 mg/cm2 Be target 0.5 -1.0 × 106 pps (70% 56Ni) 188 mg/cm2 Be S800 Spectrograph NSCL Experiment #5117, March 2007 Texas A&M Cyclotron Institute: May 2007

  11. Example: Fragmentation at MSU J.R. Brown et al. (YORK) in prep (2008) S800 – Fragment ID Drip line Z A/Q Cosenors - Bentley

  12. Example: Fragmentation at MSU J.R. Brown et al. (YORK) in prep (2008) 53Mn First spectrsocopy of N=Z-3 nuclei above 33Ar 53Ni 49V 49Fe Cosenors - Bentley

  13. Example: Fragmentation at MSU J.R. Brown et al. (YORK) in prep (2008) Charge Symmetry Breaking – spin dependence (J=2 Anomaly) Decreasing overlap of two nucleons coupled to increasing spin J Observed A=54 MED Expected MED (2 holes) Cosenors - Bentley

  14. Example: Recoil Decay Tagging at Jyvaskyla Recoil decay tagging at Jyvaskyla JUROGAM GREAT Focal plane spectrometer RITU Gas-filled recoil separator Transmission 20-50 % TDR Total Data Readout Triggerless data acquisition system with 10 ns time stamping

  15. Example: Recoil Decay Tagging at Jyvaskyla Recoil-β-tagging using GREAT A.N. Steer et al, NIM A 565, 630(2006)  Useful for odd-odd N=Z, A>60-100 and N<Z nuclei in this region.  Fermi super allowed  decays,  ~10’s of ms half lives, ~10 MeV end point energies

  16. Example: Recoil Decay Tagging at Jyvaskyla T1/2 = 47 (5) ms 78Y Results B S Nara Singh et al, PRC 75 061301(R) 2007 78Y 74Rb

  17. Example: Recoil Decay Tagging at Jyvaskyla Neutron-proton pairing effects ? Shape-changing effects ?

  18. ADVERT Next in-beam campaign at GSI... PRESPEC – spokesperson MAB 2010-2011 Cosenors - Bentley

  19. Future facilities for p-rich nuclei Future facilities (not exhasutive) HIE-ISOLDE FAIR – HISPEC (in-beam) and DESPEC (decay spectroscopy) SPIRAL2 – in-beam reactions with exotic ions, or use of high-intensity LINAC beams Cosenors - Bentley

  20. Cosenors - Bentley

More Related